preface to fifteenth edition

11.104 SECTION 11
TABLE 11.44
Factors for Simplified Computation of Volume
The volume is determined by weighing the water, having a temperature of tC, contained or delivered by the
apparatus at the same temperature. The weight of water, w grams, is obtained with brass weights in air having
a density of 1.20 mg/mL.
For apparatus made of soft glass, the volume contained or delivered at 20C is given by
wƒ m L
20 20
where 20 is the volume at 20 and ƒ 20 is the factor (apparent specific volume) obtained from the table below for
the temperature t at which the calibration is performed. The volume at any other temperature t may then be
obtained from
[1 0.00002(t 20)] mL
20
For apparatus made of any other material, the volume contained or delivered at the temperature t is
t
wft
mL
where w is again the weight in air obtained with brass weights (in grams), and f t is the factor given in the third
column of the table for the temperature t. The volume at any temperature t may then be obtained from
t
t[1 (t t)] mL
where is the cubical coefficient of thermal expansion of the material from which the apparatus is made.
Approximate values of for some frequently encountered materials are given in Table 11.45.
t, C ƒ 20 ƒ t t, C ƒ 20 ƒ t
0 1.001 62 1.001 22 20 1.002 86 1.002 86
1 54 16 21 1.003 05 1.003 07
2 48 12 22 26 30
3 43 09 23 47 53
4 41 09 24 69 77
5 1.001 39 1.001 09 25 1.003 93 1.004 03
6 40 12 26 1.004 17 29
7 42 16 27 42 56
8 45 21 28 68 84
9 50 28 29 95 1.005 13
10 1.001 56 1.001 36 30 1.005 23 1.005 43
11 63 45 31 1.005 52 1.005 74
12 72 56 32 1.005 82 1.006 06
13 82 68 33 1.006 13 1.006 39
14 93 81 34 1.006 44 1.006 72
15 1.002 06 1.001 96 35 1.006 77 1.007 07
16 20 1.002 12 36 1.007 10 1.007 42
17 35 29 37 1.007 44 1.007 78
18 51 47 38 1.007 79 1.008 15
19 68 66 39 1.008 15 1.008 53
40 1.008 52 1.008 91